【摘要】 通过磁性能测试,对金属间化合物(Dy1-xGdx)Co2(x=0,0 1,0 2,0 4,0 6)的磁熵变和磁相变进行了研究.结果表明,该化合物的居里温度随Gd含量增加呈线性提高,而其磁熵变则降低.磁熵变下降的主要原因是Gd替代Dy后化合物的磁相变由一级相变转变为二级相变.由于这种化合物在较宽温区内具有可观的磁熵变,也探讨了它用作近室温磁制冷工质的可能性.更多还原

【Abstract】 The magnetic entropy change(MEC) of (Dy1-xGdx)Co2 compounds is investigated by measuring the magnetization as function of temperature. With the increase of Gd content, the Curie temperature increases and MEC decreases correspondingly. The type of magnetic phase transition in (Dy1-xGdx)Co2 compounds is found shifting from first order to second order as Dy is substituted by Gd, which is supposed to be the main reason for the detraction of MEC. Because of the large MEC in a wide temperature range, these compounds are expected to be the potential candidate for magnetic refrigerants.更多还原